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Ajouter le résultat dans votre panierOn Plate Resolution and Identification of Three-Component Mixture of Nonionic Surfactants / A. Mohammad in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 46, N° 2/2009 (02-03/2009)
Titre : On Plate Resolution and Identification of Three-Component Mixture of Nonionic Surfactants Type de document : texte imprimé Auteurs : A. Mohammad, Auteur ; S. A. Bhawani, Auteur Année de publication : 2009 Article en page(s) : p. 81-84 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chromatographie sur couches minces
SurfactantsTags : Chromatographie couches minces Surfactants non-ioniques Triton X-100 Brij-57 Brij-78 Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Silica gel 60 F254 plates were used with mixed aqueous-organic solvent systems consisting of dioxan and lithium chloride for the chromatography of three nonionic surfactants. The resolution of coexisting Triton X-100, Brij-57 and Brij-78 was achieved with the solvent system 1,4-dioxan : 1% aqueous LiCl (40 : 60, v/v). The effect of concentration of Li+ ions in the solvent system on the mobility of the three surfactants was studied. The interference on the resolution of the mixture of Triton X-100, Brij-57 and Brij-78, due to the presence of metal cations as impurities, is also examined. The limits of detection of Triton X-100, Brij-57 and Brij-78 estimated were 0.075, 0.150 and 0.20 µg/zone respectively. The practical applicability of proposed method was tested for the identification of three coexisting nonionic surfactants after their separation from the spiked aqueous systems. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4575
in TENSIDE, SURFACTANTS, DETERGENTS > Vol. 46, N° 2/2009 (02-03/2009) . - p. 81-84[article]Réservation
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Titre : Kinetic Modelling and Equilibrium of Amphoteric Collector Adsorption on Silica and Hematite Type de document : texte imprimé Auteurs : K. A. Selim, Auteur ; F. H. Abd El-Rahiem, Auteur ; Ayman A. El-Midany, Auteur Année de publication : 2009 Article en page(s) : p. 85-91 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption
Hématite
SiliceLa silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux.
La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...).
Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale.
SurfactantsIndex. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Most of the world iron ores are associated with siliceous impurities. Upgrading schemes depend mostly on the removal of these impurities by flotation and/or selective flocculation techniques, which mainly influenced by the adsorption of collectors on both valuable and gangue minerals. In this study, the adsorption of amphoteric collector (dodecyl-N-carboxyethyl-N-hydroxyethyl-imidazoline) on silica and hematite was studied. The collector adsorption exhibits the preferential adsorption on silica at acidic pH range. While in case of hematite, the adsorption was the same over entire the studied pH range. The temperature was kept constant at 298 K and contact time of 60 min was found, from kinetic study, to be adequate to achieve equilibrium. In addition, two simplified kinetic models including a pseudo first-order equation and pseudo second-order equation were used to determine kinetic parameters, rate constants, and equilibrium sorption capacities. It was shown that the pseudo first-order equation perfectly describes the adsorption of collector. Moreover, the analysis of experimental isotherm data using the Langmuir, Freundlich, Temkin and Dubinin-Radushkevich equations showed that the Freundlich model reasonably fits the experimental data in the studied concentration range. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4576
in TENSIDE, SURFACTANTS, DETERGENTS > Vol. 46, N° 2/2009 (02-03/2009) . - p. 85-91[article]Réservation
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Titre : Interaction between a, B Layered Sodium Disilicate and Surfactants Type de document : texte imprimé Année de publication : 2009 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Sodium -- Composés
SurfactantsTags : Layered sodium disilicate Surfactant Interaction Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : This paper investigated the interaction of a-Na2Si2O5 and B-Na2Si2O5 with surfactants sodium dodecylbenzene sulfonate (LAS), sodium lauryl sulfate (K12), alkyl polyglycol ether-9 (AEO-9) and a-olefin hydrocarbon sulfonate (AOS) under condition approximating the detergent spray drying process. The interaction samples were characterized by XRD and TG. The experimental results showed that a-Na2Si2O5 and B-Na2Si2O5 sustained their phases after interacted with surfactants. The relative crystallinity of a-Na2Si2O5 had little change after interacting with surfactants exception of AOS because it had better adsorbable effect on the surface of a-Na2Si2O5 than LAS, K12 and AEO-9. At the same conditions, the amount of H2O and surfactants were both important factors on the relative crystallinity of béta-Na2Si2O5. It also was proved that the temperature had little influence on the relative crystallinity of both alpha-Na2Si2O5 and béta-Na2Si2O5. Compared with Al-d-Na2Si2O5, a-Na2Si2O5 and B-Na2Si2O5 were more stable than Al-d-Na2Si2O5 after interacted with surfactants. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4577
in TENSIDE, SURFACTANTS, DETERGENTS > Vol. 46, N° 2/2009 (02-03/2009)[article]Réservation
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Titre : Thermo-responsive Metal-chelating Surfactants : Properties and Use in Cloud Point Extraction of Uranyl Nitrate Type de document : texte imprimé Auteurs : S. Prévost, Auteur ; H. Coulombeau, Auteur ; K. Baczko, Auteur ; L. Berthon, Auteur ; N. Zorz, Auteur ; H. Desvaux, Auteur ; F. Testard, Auteur ; Th. Zemb, Auteur ; C. Larpent, Auteur Année de publication : 2009 Article en page(s) : p. 100-104 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants Tags : Thermo-responsive surfactants Metal binding Uranyl complex Cloud point extraction Nonionic Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The properties of new thermo-responsive functional surfactants, capable of forming a metal chelate, synthesized by grafting a diamide group (amino-acid residue) to the tip hydrophilic endgroup or in a branched position to polyoxyethylene nonionic surfactants [CiEj: CiH2i+1(OCH2CH2)jOH)], are studied. Their use in cloud point extraction of uranyl nitrate is tested. The reversible temperature-dependent behavior of classical non-ionic surfactants associated to phase separation of micellar solutions known as clouding behavior is exploited for separation based on cation specific binding to the chelating group. The functional surfactants under investigation combine surface-active properties and characteristic thermoreversible behavior with a capacity to bind uranyl cation. The influence of the complexation on the cloud points of functional surfactants is determined. The chelating surfactants are found efficient for the cloud point extraction of uranyl nitrate at low surfactant-to-uranyl ratio. These new thermoresponsive surfactants with chelating properties hold most promise for the development of new solvent free extraction processes. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4578
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Titre : Physiochemical Properties of Hydroxy Mixed Ether HMEn Surfactants and their Interaction with Sodium Dodecyl Sulfate SDS Type de document : texte imprimé Auteurs : R. Abdel-Rahem, Auteur ; A. S. Ayesh, Auteur Année de publication : 2009 Article en page(s) : p. 105-111 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption
Microscopie à force atomique
Sodium -- Composés organiques
SurfactantsIndex. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : This paper is focused on the phase behavior, interaction with anionic surfactant sodium dodecyl sulfate SDS, adsorption and wetting investigations of new hydroxy mixed ether nonionic surfactants HMEn. The phase diagrams of (0.1–100) %wt of HMEn (n-value is the ethoxylation number EO) at the temperature range 20–100°C have shown that the increasing of n-value raises the cloud boundary toward higher temperature. Remarkable result was obtained from the interaction between SDS and HMEB, at which the mixed system exhibits a unique homogeneity and a liquid crystal phase formation. Macroscopically, the liquid crystal region was found when the SDS concentration range between 8 and 24 mM mixed with 10% wt HMEB. The interaction between HMEn and mica was also investigated using atomic force microscopy AFM and a pronounced adsorption of HMEn on mica was observed. Moreover, contact angle results reveal that glass substrate shows strong wettability of HMEn surfactant solutions compared with polyethylene PE and polymethylmethaacrylate PMMA substrates. This wettability however also decreases with EO number. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4579
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Titre : Polycarboxylates – Essential and Multifunctional Type de document : texte imprimé Auteurs : R. Ettl, Auteur ; V. Schwendemann, Auteur ; K. Schmidt, Auteur Année de publication : 2009 Article en page(s) : p. 112-117 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cristallisation
Inhibiteurs (chimie)
Polycarboxylates
RhéologieTags : Polycarboxylates Dispersants Modifieur rhéologie Inhibiteur Cristallogenèse Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Starting from a variety of monomers as building blocks, a whole range of synthetic homopolymers and random copolymers can be easily synthesized in the laboratory and many of these polymers are commercially available. Acrylic acid in particular is a convenient and versatile starting point leading to a huge range of different polymer structures generally known as polycarboxylates. A great deal of work has been published on the effects polycarboxylates provide in laundry detergents. They have a pronounced dispersing capacity for particulate soil and sparingly soluble salts such as calcium carbonate and thus they are able to counteract incrustation and redeposition of soil onto fabrics. The incorporation of side chains of different lengths and chemistry opened the field of highly efficient rheology modifiers. This synthetic development has been aided by an increased understanding of the mode of action on a molecular level. Knowledge about the interaction of water-soluble polymers with nonionic and ionic surfactants and with particles has grown significantly and is still an area of great interest. Further, recent studies have shed more light on the dynamics of crystal growth of calcium carbonate in various environments and the role of polycarboxylates and other polymers in this process. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4594
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| Code-barres | Cote | Support | Localisation | Section | Disponibilité |
|---|---|---|---|---|---|
| 011181 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |
